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November 2005

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 2 Nov 2005 16:44:23 EST
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Hi 'J,'
For some PCBs the 'standard' FR-4 [which is certainly quite a bit better now
than back in the 80's]will be sufficient [thin PCBs, small components], but
for thicker PCBs seeing multiple reflow/wave/rework/repair soldering excursions
you may want to shoot for a high Tg/high Td/low alpha2 material [also, beware
some materials change their properties (CTE) significantly after exposuore to
soldering temperatures]. Moisture bake-out is amust regardless.

Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com


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